What about it? In the UK at least you don't need any kind of special licence to drive for amazon, just a normal B-class licence will do, all of their vans are up to 3.5 tonnes anyway. You only need a C class licence and professional accreditation to drive HGVs.
I’m not sure about the UK but several minutes of frustrated googling only shows offerings for amazons gig delivery program called flex, vaguely ironically.